Mercedes-Benz OM636 engine

The Mercedes-Benz OM 636 is a diesel engine produced by Daimler-Benz. It was introduced in 1949. It is the successor of the OM 138. During its long production time, the OM 636 was first used as a passenger car engine in the Mercedes-Benz W 136 starting in 1949. Later, it was sold as an industrial engine and had many applications in vehicles such as light trucks, boats, and combine harvesters. It was succeeded by the OM 621. However, after the introduction of the OM 621, the OM 636 was kept in production until 1990.

Mercedes-Benz OM636 engine
Overview
ManufacturerDaimler-Benz AG
Production1949–1990
Layout
ConfigurationInline 4
Displacement1.697 L (103.6 in3)
1.767 L (107.8 in3)
Cylinder bore73.5 mm (2.89 in)
75 mm (2.95 in)
Piston stroke100 mm (3.94 in)
Block materialCast iron
Head materialCast iron
ValvetrainOHV
Compression ratio19.0:1
RPM range
Redline3600
Combustion
Operating principleDiesel
Fuel systemPrecombustion chamber injection
Fuel typeGasoil
Oil systemWet sump
Cooling systemWater-cooled
Output
Power output28–32 kW (38–44 PS; 38–43 hp)
Torque output96–101 N⋅m (71–74 lb⋅ft)
Chronology
PredecessorOM 138
SuccessorOM 621

The abbreviation OM means Oelmotor (oil engine), and stands for a Daimler-Benz engine that uses any kind of oil as fuel (diesel engine).

History

In 1949, the W 136 was offered with the OM 636 displacing 1.7 L producing 38 PS (28 kW). For a short period of time between January 1952 and August 1953, a facelifted version of the W 136 (now having the chassis code W 191) was sold. Its OM 636 was increased in power by 2 PS. In 1953, the W 120 succeeded the W 191, starting in 1954 it was offered with an upgraded version of the OM 636 now displacing 1.8 L and making 40 PS (29 kW). After the introduction of the W 110 in 1961, the OM 636 was no longer used as a passenger car engine by Daimler-Benz. The production in Germany was stopped in the early 1960s. In Spain, the production continued until 1990.

Technical description
The OM 636's Bosch inline injection pump

The OM 636 is a water-cooled inline-four-cylinder diesel engine with precombustion chamber injection, OHV valvetrain and wet sump lubrication. Both the cylinder head and the cylinder block are made of grey cast iron. Both the crankshaft, which is supported in three bearings, and the connection rods are forged. The pistons are made of a light metal alloy. In the cylinder head, the OM 636 has two overhead valves per cylinder. The camshaft is driven by gears, it also drives the inline injection pump. The inlet and the precombustion chambers are on the left engine side, the outlet, camshaft and injection pump are placed on the right engine side.

Technical data
Engine codeEngine nameBore × StrokeDisplacementCompression ratioRated power (DIN 70020)Torque (DIN 70020)Source
OM 636.915OM 636 I73.5 mm × 100 mm (2.89 in × 3.94 in)1,697 cm3 (103.6 in3)19.0:138 PS (28 kW; 37 hp) at 3200 rpm9.8 kp⋅m (96 N⋅m; 71 lb⋅ft) at 2000 rpm[1]
OM 636.91225 PS (18 kW; 25 hp) at 2300 rpm[2]
OM 636.916OM 636 VI75 mm × 100 mm (2.95 in × 3.94 in)1,767 cm3 (107.8 in3)40 PS (29 kW; 39 hp) at 3200 rpm10.3 kp⋅m (101 N⋅m; 75 lb⋅ft) at 2000 rpm[3]
OM 636.931OM 636 VIII[4]
OM 636.930OM 636 VII[5]
43 PS (32 kW; 42 hp) at 3500 rpm
OM 636.914OM 636 VI30 PS (22 kW; 30 hp) at 2550 rpm[2]
32 PS (24 kW; 32 hp) at 2550 rpm
34 PS (25 kW; 34 hp) at 2750 rpm
25 PS (18 kW; 25 hp) at 2300 rpm


See also

References
  1. Daimler AG (ed.): 170 D, in Mercedes-Benz Public Archive, retrieved 8 January 2021
  2. Carl-Heinz Vogler: Unimog 411: Typengeschichte und Technik, Geramond, München 2014, ISBN 978-3-86245-605-5, p. 49
  3. Daimler AG (ed.): 170 Db, in Mercedes-Benz Public Archive, retrieved 8 January 2021
  4. Daimler AG (ed.): 170 S-D, in Mercedes-Benz Public Archive, retrieved 8 January 2021
  5. Daimler AG (ed.): 180 D, in Mercedes-Benz Public Archive, retrieved 8 January 2021

Bibliography
  • Der 1,8-l-Dieselmotor des Mercedes-Benz 170 Da in: Kraftfahrzeugtechnik 7/1952, p.211-213
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